Which type of propellant ignites the quickest?

Black powder is recognized for its rapid ignition properties due to its simple chemical composition and the nature of its ingredients. When ignited, black powder undergoes a quick exothermic reaction, resulting in an immediate release of gases and heat. This rapid combustion is a key characteristic that makes it suitable for applications where a quick thrust is needed, such as in model rocketry.

In contrast, composite propellants, which are typically made from a mixture of powdered oxidizers and fuel bound together in a solid form, often have a more controlled burn rate. While composite propellants can achieve higher performance and efficiency, they generally ignite and burn more slowly compared to black powder due to the requirement for thorough mixing and the more complex chemical reactions involved.

Therefore, the choice that states black powder ignites the quickest accurately reflects the basic properties of rocket propellants, where the simplicity and high reactivity of black powder allow for a significantly faster ignition time.